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Physics

Physics
The unit of noise pollution (level) is :

None of these
Ppm
Decimal
Decibel

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Physics
A metal-semiconductor junction diode is called ________

Tunnel diode
Schottky diode
P-N Juction diode
Photo diode

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Physics
When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs in the loudness of tone. This phenomenon is known as

Echo
Beats
Doppler effect
Resonance

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Physics
Flywheel is an important part of a steam engine because it :

Decreases the moment of inertia
Gives strength to the engine
Accelerates the speed of the engine
Helps the engine in keeping the speed uniform

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Physics
A gradual increase in loudness is known as

Fortissimo
Timbre
None of these
Crescendo

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Physics
Megahertz is a measurement of

Wavelength
Frequency
Capacity
Speed

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